I would like some additional information about this patient, including his Signs, Symptoms, Allergies, Medications, Past Medical History, Last Intake & Events prior to the arrest. I would also like to know his vital signs & what treatments he has received. Instead of starting Dopamine, I would probably give this patient a 500 ML fluid bolus of LR or NS first & treat any hypovolemia before I started Dopamine, I would also consider giving him a trial bolus of Lidocaine 1 mg/kg. Lidocaine supressess ventricular ectopy, increases the ventricular fibrillation threshold, it also reduces the velocity of electrical impulse through the hearts conduction system. Lidocaine can be used in Wide Complex Tachycardia of an uncertain origin. If the heart rate was 150 or greater then I would consider cardioversion.